课程: Java Algorithms

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Standard queue operations in Java

Standard queue operations in Java - Java教程

课程: Java Algorithms

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Standard queue operations in Java

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- [Instructor] To use queues in Java, we have the java.util.Queue interface. We'll import it at the top. Since an interface is not concrete, we'll need to instantiate an implementation of the interface in order to use it. In Java, we can choose between a LinkedList and a priority queue. LinkedList is a pretty standard queue implementation, so we're going to use it for our implementation of the queue interface. To create a queue, we'll create a new queue object from a LinkedList. It will contain integers. Like LinkedList, the queue interface is generic so it can contain elements of any type you specify. To add elements to the queue, we'll use the add method. We'll add two, three and a few other numbers. Now, to follow the FIFO policy, the first item in the queue must be the first item out of the queue. This means the number two will be removed first since it was added first. To remove this number, we can use the remove method. Let's save it in a variable called removedItem and we'll…

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